Page({
  data: {
    onInitChart(F2, config) {
      const chart = new F2.Chart(config);
      const data = [{
          value: 63.4,
          city: 'New York',
          date: '2011-10-01'
        },
        {
          value: 62.7,
          city: 'Alaska',
          date: '2011-10-01'
        },
        {
          value: 72.2,
          city: 'Austin',
          date: '2011-10-01'
        },
        {
          value: 58,
          city: 'New York',
          date: '2011-10-02'
        },
        {
          value: 59.9,
          city: 'Alaska',
          date: '2011-10-02'
        },
        {
          value: 67.7,
          city: 'Austin',
          date: '2011-10-02'
        },
        {
          value: 53.3,
          city: 'New York',
          date: '2011-10-03'
        },
        {
          value: 59.1,
          city: 'Alaska',
          date: '2011-10-03'
        },
        {
          value: 69.4,
          city: 'Austin',
          date: '2011-10-03'
        },
      ];
      chart.source(data, {
        date: {
          range: [0, 1],
          type: 'timeCat',
          mask: 'MM-DD'
        },
        value: {
          max: 300,
          tickCount: 4
        }
      });
      chart.area().position('date*value').color('city').adjust('stack');
      chart.line().position('date*value').color('city').adjust('stack');
      chart.render();
      // 注意：需要把chart return 出来
      return chart;
    }
  },
  onLoad() {
    // wx.startPullDownRefresh({
    //   complete: (res) => {},
    // })
  },
  onPullDownRefresh() {
    console.log('刷新中...')
  }
});